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采前一个月，对早熟品种辽伏苹果喷布５０％甲基对硫磷乳油１０００倍液。对其果皮及果肉中甲基对硫磷的残留分析表明，喷后第１２天及第４天，果皮及果肉中甲基对硫磷的残留浓度分别降至０．１４９、０．１４７ｍｇ·ｌ~(-１)。采用灰色系统（ＧＭ）分析，果皮中农药降解速率受自身残留浓度影响最大，而果肉中受果实膨大增长的影响最大。
A month before mining, the early maturing varieties Liaobu apple spray 50% methyl parathion EC 1000 times. Residues analysis of methyl parathion in its peel and pulp showed that the residual concentrations of methyl parathion in peel and pulp decreased to 0.149 and 0.147 mg · L ~ (-1). By using the gray system (GM) analysis, the degradation rate of pesticides in the peel was the most affected by its own residual concentration, while the flesh was most affected by the enlargement and growth of the fruit.